inode.c 49.5 KB
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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
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 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
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 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
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 * of the GNU General Public License version 2.
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 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/fiemap.h>
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#include <linux/security.h>
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#include <asm/uaccess.h>

#include "gfs2.h"
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#include "incore.h"
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#include "acl.h"
#include "bmap.h"
#include "dir.h"
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#include "xattr.h"
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#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
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#include "util.h"
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#include "super.h"
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#include "glops.h"

struct gfs2_skip_data {
	u64 no_addr;
	int skipped;
	int non_block;
};

static int iget_test(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_skip_data *data = opaque;

	if (ip->i_no_addr == data->no_addr) {
		if (data->non_block &&
		    inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
			data->skipped = 1;
			return 0;
		}
		return 1;
	}
	return 0;
}

static int iget_set(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_skip_data *data = opaque;

	if (data->skipped)
		return -ENOENT;
	inode->i_ino = (unsigned long)(data->no_addr);
	ip->i_no_addr = data->no_addr;
	return 0;
}

struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
{
	unsigned long hash = (unsigned long)no_addr;
	struct gfs2_skip_data data;

	data.no_addr = no_addr;
	data.skipped = 0;
	data.non_block = non_block;
	return ilookup5(sb, hash, iget_test, &data);
}

static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
			       int non_block)
{
	struct gfs2_skip_data data;
	unsigned long hash = (unsigned long)no_addr;

	data.no_addr = no_addr;
	data.skipped = 0;
	data.non_block = non_block;
	return iget5_locked(sb, hash, iget_test, iget_set, &data);
}

/**
 * gfs2_set_iop - Sets inode operations
 * @inode: The inode with correct i_mode filled in
 *
 * GFS2 lookup code fills in vfs inode contents based on info obtained
 * from directory entry inside gfs2_inode_lookup().
 */

static void gfs2_set_iop(struct inode *inode)
{
	struct gfs2_sbd *sdp = GFS2_SB(inode);
	umode_t mode = inode->i_mode;

	if (S_ISREG(mode)) {
		inode->i_op = &gfs2_file_iops;
		if (gfs2_localflocks(sdp))
			inode->i_fop = &gfs2_file_fops_nolock;
		else
			inode->i_fop = &gfs2_file_fops;
	} else if (S_ISDIR(mode)) {
		inode->i_op = &gfs2_dir_iops;
		if (gfs2_localflocks(sdp))
			inode->i_fop = &gfs2_dir_fops_nolock;
		else
			inode->i_fop = &gfs2_dir_fops;
	} else if (S_ISLNK(mode)) {
		inode->i_op = &gfs2_symlink_iops;
	} else {
		inode->i_op = &gfs2_file_iops;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
}

/**
 * gfs2_inode_lookup - Lookup an inode
 * @sb: The super block
 * @no_addr: The inode number
 * @type: The type of the inode
 * non_block: Can we block on inodes that are being freed?
 *
 * Returns: A VFS inode, or an error
 */

struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
				u64 no_addr, u64 no_formal_ino, int non_block)
{
	struct inode *inode;
	struct gfs2_inode *ip;
	struct gfs2_glock *io_gl = NULL;
	int error;

	inode = gfs2_iget(sb, no_addr, non_block);
	ip = GFS2_I(inode);

	if (!inode)
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		return ERR_PTR(-ENOMEM);
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	if (inode->i_state & I_NEW) {
		struct gfs2_sbd *sdp = GFS2_SB(inode);
		ip->i_no_formal_ino = no_formal_ino;

		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
		if (unlikely(error))
			goto fail;
		ip->i_gl->gl_object = ip;

		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
		if (unlikely(error))
			goto fail_put;

		set_bit(GIF_INVALID, &ip->i_flags);
		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
		if (unlikely(error))
			goto fail_iopen;

		ip->i_iopen_gh.gh_gl->gl_object = ip;
		gfs2_glock_put(io_gl);
		io_gl = NULL;

		if (type == DT_UNKNOWN) {
			/* Inode glock must be locked already */
			error = gfs2_inode_refresh(GFS2_I(inode));
			if (error)
				goto fail_refresh;
		} else {
			inode->i_mode = DT2IF(type);
		}

		gfs2_set_iop(inode);
		unlock_new_inode(inode);
	}

	return inode;

fail_refresh:
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	ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
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	ip->i_iopen_gh.gh_gl->gl_object = NULL;
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	gfs2_glock_dq_wait(&ip->i_iopen_gh);
	gfs2_holder_uninit(&ip->i_iopen_gh);
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fail_iopen:
	if (io_gl)
		gfs2_glock_put(io_gl);
fail_put:
	ip->i_gl->gl_object = NULL;
fail:
	iget_failed(inode);
	return ERR_PTR(error);
}

struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
				  u64 *no_formal_ino, unsigned int blktype)
{
	struct super_block *sb = sdp->sd_vfs;
	struct gfs2_holder i_gh;
	struct inode *inode = NULL;
	int error;

	/* Must not read in block until block type is verified */
	error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
				  LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
	if (error)
		return ERR_PTR(error);

	error = gfs2_check_blk_type(sdp, no_addr, blktype);
	if (error)
		goto fail;

	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
	if (IS_ERR(inode))
		goto fail;

	/* Two extra checks for NFS only */
	if (no_formal_ino) {
		error = -ESTALE;
		if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
			goto fail_iput;

		error = -EIO;
		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
			goto fail_iput;

		error = 0;
	}

fail:
	gfs2_glock_dq_uninit(&i_gh);
	return error ? ERR_PTR(error) : inode;
fail_iput:
	iput(inode);
	goto fail;
}


struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
	struct qstr qstr;
	struct inode *inode;
	gfs2_str2qstr(&qstr, name);
	inode = gfs2_lookupi(dip, &qstr, 1);
	/* gfs2_lookupi has inconsistent callers: vfs
	 * related routines expect NULL for no entry found,
	 * gfs2_lookup_simple callers expect ENOENT
	 * and do not check for NULL.
	 */
	if (inode == NULL)
		return ERR_PTR(-ENOENT);
	else
		return inode;
}


/**
 * gfs2_lookupi - Look up a filename in a directory and return its inode
 * @d_gh: An initialized holder for the directory glock
 * @name: The name of the inode to look for
 * @is_root: If 1, ignore the caller's permissions
 * @i_gh: An uninitialized holder for the new inode glock
 *
 * This can be called via the VFS filldir function when NFS is doing
 * a readdirplus and the inode which its intending to stat isn't
 * already in cache. In this case we must not take the directory glock
 * again, since the readdir call will have already taken that lock.
 *
 * Returns: errno
 */

struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
			   int is_root)
{
	struct super_block *sb = dir->i_sb;
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_holder d_gh;
	int error = 0;
	struct inode *inode = NULL;
	int unlock = 0;

	if (!name->len || name->len > GFS2_FNAMESIZE)
		return ERR_PTR(-ENAMETOOLONG);

	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
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	     dir == d_inode(sb->s_root))) {
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		igrab(dir);
		return dir;
	}

	if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
		if (error)
			return ERR_PTR(error);
		unlock = 1;
	}

	if (!is_root) {
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		error = gfs2_permission(dir, MAY_EXEC);
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		if (error)
			goto out;
	}

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	inode = gfs2_dir_search(dir, name, false);
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	if (IS_ERR(inode))
		error = PTR_ERR(inode);
out:
	if (unlock)
		gfs2_glock_dq_uninit(&d_gh);
	if (error == -ENOENT)
		return NULL;
	return inode ? inode : ERR_PTR(error);
}

/**
 * create_ok - OK to create a new on-disk inode here?
 * @dip:  Directory in which dinode is to be created
 * @name:  Name of new dinode
 * @mode:
 *
 * Returns: errno
 */

static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
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		     umode_t mode)
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{
	int error;

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	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
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	if (error)
		return error;

	/*  Don't create entries in an unlinked directory  */
	if (!dip->i_inode.i_nlink)
		return -ENOENT;

	if (dip->i_entries == (u32)-1)
		return -EFBIG;
	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
		return -EMLINK;

	return 0;
}

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static void munge_mode_uid_gid(const struct gfs2_inode *dip,
			       struct inode *inode)
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{
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
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	    (dip->i_inode.i_mode & S_ISUID) &&
	    !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
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		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISUID;
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		else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
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			inode->i_mode &= ~07111;
		inode->i_uid = dip->i_inode.i_uid;
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	} else
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		inode->i_uid = current_fsuid();
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	if (dip->i_inode.i_mode & S_ISGID) {
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		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISGID;
		inode->i_gid = dip->i_inode.i_gid;
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	} else
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		inode->i_gid = current_fsgid();
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}

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static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
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{
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	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
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	int error;

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	error = gfs2_quota_lock_check(ip, &ap);
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	if (error)
		goto out;

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	error = gfs2_inplace_reserve(ip, &ap);
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	if (error)
		goto out_quota;

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	error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
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	if (error)
		goto out_ipreserv;

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	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
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	ip->i_no_formal_ino = ip->i_generation;
	ip->i_inode.i_ino = ip->i_no_addr;
	ip->i_goal = ip->i_no_addr;
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	gfs2_trans_end(sdp);

out_ipreserv:
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	gfs2_inplace_release(ip);
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out_quota:
	gfs2_quota_unlock(ip);
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out:
	return error;
}

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static void gfs2_init_dir(struct buffer_head *dibh,
			  const struct gfs2_inode *parent)
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{
	struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
	struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);

	gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
	dent->de_inum = di->di_num; /* already GFS2 endian */
	dent->de_type = cpu_to_be16(DT_DIR);

	dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
	gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
	gfs2_inum_out(parent, dent);
	dent->de_type = cpu_to_be16(DT_DIR);
	
}

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/**
 * gfs2_init_xattr - Initialise an xattr block for a new inode
 * @ip: The inode in question
 *
 * This sets up an empty xattr block for a new inode, ready to
 * take any ACLs, LSM xattrs, etc.
 */

static void gfs2_init_xattr(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct buffer_head *bh;
	struct gfs2_ea_header *ea;

	bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
	gfs2_trans_add_meta(ip->i_gl, bh);
	gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
	gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));

	ea = GFS2_EA_BH2FIRST(bh);
	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
	ea->ea_type = GFS2_EATYPE_UNUSED;
	ea->ea_flags = GFS2_EAFLAG_LAST;

	brelse(bh);
}

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/**
 * init_dinode - Fill in a new dinode structure
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 * @dip: The directory this inode is being created in
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 * @ip: The inode
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 * @symname: The symlink destination (if a symlink)
 * @bhp: The buffer head (returned to caller)
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 *
 */

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static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
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			const char *symname)
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{
	struct gfs2_dinode *di;
	struct buffer_head *dibh;

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	dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
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	gfs2_trans_add_meta(ip->i_gl, dibh);
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	di = (struct gfs2_dinode *)dibh->b_data;
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	gfs2_dinode_out(ip, di);
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	di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
	di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
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	di->__pad1 = 0;
	di->__pad2 = 0;
	di->__pad3 = 0;
	memset(&di->__pad4, 0, sizeof(di->__pad4));
	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
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	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
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	switch(ip->i_inode.i_mode & S_IFMT) {
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	case S_IFDIR:
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		gfs2_init_dir(dibh, dip);
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		break;
	case S_IFLNK:
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		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
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		break;
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	}

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	set_buffer_uptodate(dibh);
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	brelse(dibh);
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}

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/**
 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 * @dip: The directory we are linking into
 * @da: The dir add information
 * @nr_inodes: The number of inodes involved
 *
 * This calculate the number of blocks we need to reserve in a
 * transaction to link @nr_inodes into a directory. In most cases
 * @nr_inodes will be 2 (the directory plus the inode being linked in)
 * but in case of rename, 4 may be required.
 *
 * Returns: Number of blocks
 */

static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
				   const struct gfs2_diradd *da,
				   unsigned nr_inodes)
{
	return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
	       (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
}

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static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
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		       struct gfs2_inode *ip, struct gfs2_diradd *da)
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{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
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	int error;

527
	if (da->nr_blocks) {
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		error = gfs2_quota_lock_check(dip, &ap);
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		if (error)
			goto fail_quota_locks;

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		error = gfs2_inplace_reserve(dip, &ap);
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		if (error)
			goto fail_quota_locks;

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		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
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		if (error)
			goto fail_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
		if (error)
			goto fail_quota_locks;
	}

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	error = gfs2_dir_add(&dip->i_inode, name, ip, da);
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	gfs2_trans_end(sdp);
fail_ipreserv:
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	gfs2_inplace_release(dip);
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fail_quota_locks:
	gfs2_quota_unlock(dip);
	return error;
}

555
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
556
		    void *fs_info)
557
{
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	const struct xattr *xattr;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
				       xattr->value_len, 0,
				       GFS2_EATYPE_SECURITY);
		if (err < 0)
			break;
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	}
	return err;
}
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/**
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 * gfs2_create_inode - Create a new inode
 * @dir: The parent directory
 * @dentry: The new dentry
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 * @file: If non-NULL, the file which is being opened
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 * @mode: The permissions on the new inode
 * @dev: For device nodes, this is the device number
 * @symname: For symlinks, this is the link destination
 * @size: The initial size of the inode (ignored for directories)
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 *
581
 * Returns: 0 on success, or error code
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 */

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static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
585
			     struct file *file,
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			     umode_t mode, dev_t dev, const char *symname,
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			     unsigned int size, int excl, int *opened)
588
{
589
	const struct qstr *name = &dentry->d_name;
590
	struct posix_acl *default_acl, *acl;
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	struct gfs2_holder ghs[2];
592
	struct inode *inode = NULL;
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	struct gfs2_inode *dip = GFS2_I(dir), *ip;
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	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
595
	struct gfs2_glock *io_gl = NULL;
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	int error, free_vfs_inode = 1;
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	u32 aflags = 0;
598
	unsigned blocks = 1;
599
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
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	if (!name->len || name->len > GFS2_FNAMESIZE)
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		return -ENAMETOOLONG;
603

604
	error = gfs2_rsqa_alloc(dip);
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	if (error)
		return error;

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	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

612
	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
613 614 615 616
	if (error)
		goto fail;

	error = create_ok(dip, name, mode);
617 618 619 620 621 622
	if (error)
		goto fail_gunlock;

	inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
	error = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
623 624 625 626 627
		if (S_ISDIR(inode->i_mode)) {
			iput(inode);
			inode = ERR_PTR(-EISDIR);
			goto fail_gunlock;
		}
628
		d_instantiate(dentry, inode);
629
		error = 0;
630
		if (file) {
631
			if (S_ISREG(inode->i_mode))
M
Miklos Szeredi 已提交
632
				error = finish_open(file, dentry, gfs2_open_common, opened);
633 634
			else
				error = finish_no_open(file, NULL);
635
		}
S
Steven Whitehouse 已提交
636
		gfs2_glock_dq_uninit(ghs);
637
		return error;
638
	} else if (error != -ENOENT) {
639
		goto fail_gunlock;
640
	}
641

642
	error = gfs2_diradd_alloc_required(dir, name, &da);
643 644 645
	if (error < 0)
		goto fail_gunlock;

646
	inode = new_inode(sdp->sd_vfs);
647 648 649 650
	error = -ENOMEM;
	if (!inode)
		goto fail_gunlock;

651 652
	error = posix_acl_create(dir, &mode, &default_acl, &acl);
	if (error)
653
		goto fail_gunlock;
654

655
	ip = GFS2_I(inode);
656
	error = gfs2_rsqa_alloc(ip);
657
	if (error)
658
		goto fail_free_acls;
659 660

	inode->i_mode = mode;
661
	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
662 663
	inode->i_rdev = dev;
	inode->i_size = size;
664
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
665
	gfs2_set_inode_blocks(inode, 1);
666
	munge_mode_uid_gid(dip, inode);
667
	check_and_update_goal(dip);
668
	ip->i_goal = dip->i_goal;
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
	ip->i_diskflags = 0;
	ip->i_eattr = 0;
	ip->i_height = 0;
	ip->i_depth = 0;
	ip->i_entries = 0;

	switch(mode & S_IFMT) {
	case S_IFREG:
		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
		    gfs2_tune_get(sdp, gt_new_files_jdata))
			ip->i_diskflags |= GFS2_DIF_JDATA;
		gfs2_set_aops(inode);
		break;
	case S_IFDIR:
		ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
		ip->i_diskflags |= GFS2_DIF_JDATA;
		ip->i_entries = 2;
		break;
	}
688 689 690 691 692

	/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
	if (dip->i_diskflags & GFS2_DIF_SYSTEM)
		ip->i_diskflags |= GFS2_DIF_SYSTEM;

693
	gfs2_set_inode_flags(inode);
694

695
	if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
S
Steven Whitehouse 已提交
696 697 698
	    (dip->i_diskflags & GFS2_DIF_TOPDIR))
		aflags |= GFS2_AF_ORLOV;

699 700 701 702
	if (default_acl || acl)
		blocks++;

	error = alloc_dinode(ip, aflags, &blocks);
703
	if (error)
704
		goto fail_free_inode;
705

706 707
	gfs2_set_inode_blocks(inode, blocks);

708
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
709
	if (error)
710
		goto fail_free_inode;
711

712
	ip->i_gl->gl_object = ip;
713 714 715 716
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
	if (error)
		goto fail_free_inode;

717
	error = gfs2_trans_begin(sdp, blocks, 0);
718
	if (error)
719 720
		goto fail_gunlock2;

721 722 723 724
	if (blocks > 1) {
		ip->i_eattr = ip->i_no_addr + 1;
		gfs2_init_xattr(ip);
	}
725
	init_dinode(dip, ip, symname);
726 727
	gfs2_trans_end(sdp);

728
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
729 730 731
	if (error)
		goto fail_gunlock2;

732 733
	BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));

734
	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
735 736
	if (error)
		goto fail_gunlock2;
737

738 739 740 741 742
	ip->i_iopen_gh.gh_gl->gl_object = ip;
	gfs2_glock_put(io_gl);
	gfs2_set_iop(inode);
	insert_inode_hash(inode);

743 744 745
	free_vfs_inode = 0; /* After this point, the inode is no longer
			       considered free. Any failures need to undo
			       the gfs2 structures. */
746 747 748 749 750 751 752 753 754 755
	if (default_acl) {
		error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
		posix_acl_release(default_acl);
	}
	if (acl) {
		if (!error)
			error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
		posix_acl_release(acl);
	}

756
	if (error)
757
		goto fail_gunlock3;
758

759 760
	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
					     &gfs2_initxattrs, NULL);
761
	if (error)
762
		goto fail_gunlock3;
763

764
	error = link_dinode(dip, name, ip, &da);
765
	if (error)
766
		goto fail_gunlock3;
767

768
	mark_inode_dirty(inode);
769
	d_instantiate(dentry, inode);
M
Miklos Szeredi 已提交
770 771
	if (file) {
		*opened |= FILE_CREATED;
772
		error = finish_open(file, dentry, gfs2_open_common, opened);
M
Miklos Szeredi 已提交
773
	}
774 775
	gfs2_glock_dq_uninit(ghs);
	gfs2_glock_dq_uninit(ghs + 1);
776
	clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
777
	return error;
778

779
fail_gunlock3:
780 781
	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
	gfs2_glock_put(io_gl);
782
fail_gunlock2:
783 784
	if (io_gl)
		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
785
	gfs2_glock_dq_uninit(ghs + 1);
786 787 788
fail_free_inode:
	if (ip->i_gl)
		gfs2_glock_put(ip->i_gl);
789
	gfs2_rsqa_delete(ip, NULL);
790 791 792 793 794
fail_free_acls:
	if (default_acl)
		posix_acl_release(default_acl);
	if (acl)
		posix_acl_release(acl);
795
fail_gunlock:
796
	gfs2_dir_no_add(&da);
797
	gfs2_glock_dq_uninit(ghs);
798
	if (inode && !IS_ERR(inode)) {
799
		clear_nlink(inode);
800 801 802 803
		if (!free_vfs_inode)
			mark_inode_dirty(inode);
		set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
			&GFS2_I(inode)->i_flags);
804 805
		iput(inode);
	}
806
fail:
807
	return error;
808
}
809

D
David Teigland 已提交
810 811 812 813 814 815 816 817 818 819
/**
 * gfs2_create - Create a file
 * @dir: The directory in which to create the file
 * @dentry: The dentry of the new file
 * @mode: The mode of the new file
 *
 * Returns: errno
 */

static int gfs2_create(struct inode *dir, struct dentry *dentry,
A
Al Viro 已提交
820
		       umode_t mode, bool excl)
D
David Teigland 已提交
821
{
822
	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
D
David Teigland 已提交
823 824 825
}

/**
826
 * __gfs2_lookup - Look up a filename in a directory and return its inode
D
David Teigland 已提交
827 828
 * @dir: The directory inode
 * @dentry: The dentry of the new inode
829 830
 * @file: File to be opened
 * @opened: atomic_open flags
D
David Teigland 已提交
831 832 833 834 835
 *
 *
 * Returns: errno
 */

836 837
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
				    struct file *file, int *opened)
D
David Teigland 已提交
838
{
839 840 841 842 843 844 845
	struct inode *inode;
	struct dentry *d;
	struct gfs2_holder gh;
	struct gfs2_glock *gl;
	int error;

	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
846 847
	if (inode == NULL) {
		d_add(dentry, NULL);
848
		return NULL;
849
	}
850 851 852 853 854 855 856 857
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	gl = GFS2_I(inode)->i_gl;
	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
	if (error) {
		iput(inode);
		return ERR_PTR(error);
858
	}
859 860

	d = d_splice_alias(inode, dentry);
861 862 863 864
	if (IS_ERR(d)) {
		gfs2_glock_dq_uninit(&gh);
		return d;
	}
865 866 867 868
	if (file && S_ISREG(inode->i_mode))
		error = finish_open(file, dentry, gfs2_open_common, opened);

	gfs2_glock_dq_uninit(&gh);
M
Miklos Szeredi 已提交
869 870
	if (error) {
		dput(d);
871
		return ERR_PTR(error);
M
Miklos Szeredi 已提交
872
	}
873 874 875 876 877 878 879
	return d;
}

static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
				  unsigned flags)
{
	return __gfs2_lookup(dir, dentry, NULL, NULL);
D
David Teigland 已提交
880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
}

/**
 * gfs2_link - Link to a file
 * @old_dentry: The inode to link
 * @dir: Add link to this directory
 * @dentry: The name of the link
 *
 * Link the inode in "old_dentry" into the directory "dir" with the
 * name in "dentry".
 *
 * Returns: errno
 */

static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
		     struct dentry *dentry)
{
897 898
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
899
	struct inode *inode = d_inode(old_dentry);
900
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
901
	struct gfs2_holder ghs[2];
902
	struct buffer_head *dibh;
903
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
D
David Teigland 已提交
904 905
	int error;

906
	if (S_ISDIR(inode->i_mode))
D
David Teigland 已提交
907 908
		return -EPERM;

909
	error = gfs2_rsqa_alloc(dip);
910 911 912
	if (error)
		return error;

D
David Teigland 已提交
913 914 915
	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);

916 917 918 919 920
	error = gfs2_glock_nq(ghs); /* parent */
	if (error)
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
D
David Teigland 已提交
921
	if (error)
922
		goto out_child;
D
David Teigland 已提交
923

924 925 926 927
	error = -ENOENT;
	if (inode->i_nlink == 0)
		goto out_gunlock;

928
	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
929 930 931
	if (error)
		goto out_gunlock;

932
	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
D
David Teigland 已提交
933 934 935 936 937 938 939 940 941 942
	switch (error) {
	case -ENOENT:
		break;
	case 0:
		error = -EEXIST;
	default:
		goto out_gunlock;
	}

	error = -EINVAL;
943
	if (!dip->i_inode.i_nlink)
D
David Teigland 已提交
944 945
		goto out_gunlock;
	error = -EFBIG;
946
	if (dip->i_entries == (u32)-1)
D
David Teigland 已提交
947 948 949 950 951
		goto out_gunlock;
	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out_gunlock;
	error = -EINVAL;
952
	if (!ip->i_inode.i_nlink)
D
David Teigland 已提交
953 954
		goto out_gunlock;
	error = -EMLINK;
955
	if (ip->i_inode.i_nlink == (u32)-1)
D
David Teigland 已提交
956 957
		goto out_gunlock;

958
	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
959
	if (error < 0)
D
David Teigland 已提交
960 961
		goto out_gunlock;

962 963
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
964
		error = gfs2_quota_lock_check(dip, &ap);
D
David Teigland 已提交
965
		if (error)
966
			goto out_gunlock;
D
David Teigland 已提交
967

968
		error = gfs2_inplace_reserve(dip, &ap);
D
David Teigland 已提交
969 970 971
		if (error)
			goto out_gunlock_q;

972
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
D
David Teigland 已提交
973 974 975 976 977 978 979 980
		if (error)
			goto out_ipres;
	} else {
		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
		if (error)
			goto out_ipres;
	}

981
	error = gfs2_meta_inode_buffer(ip, &dibh);
D
David Teigland 已提交
982 983 984
	if (error)
		goto out_end_trans;

985
	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
986 987 988
	if (error)
		goto out_brelse;

989
	gfs2_trans_add_meta(ip->i_gl, dibh);
990 991
	inc_nlink(&ip->i_inode);
	ip->i_inode.i_ctime = CURRENT_TIME;
S
Steven Whitehouse 已提交
992 993 994
	ihold(inode);
	d_instantiate(dentry, inode);
	mark_inode_dirty(inode);
D
David Teigland 已提交
995

996 997
out_brelse:
	brelse(dibh);
998
out_end_trans:
D
David Teigland 已提交
999
	gfs2_trans_end(sdp);
1000
out_ipres:
1001
	if (da.nr_blocks)
D
David Teigland 已提交
1002
		gfs2_inplace_release(dip);
1003
out_gunlock_q:
1004
	if (da.nr_blocks)
D
David Teigland 已提交
1005
		gfs2_quota_unlock(dip);
1006
out_gunlock:
1007
	gfs2_dir_no_add(&da);
1008 1009 1010 1011
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
D
David Teigland 已提交
1012 1013 1014 1015 1016
	gfs2_holder_uninit(ghs);
	gfs2_holder_uninit(ghs + 1);
	return error;
}

1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
/*
 * gfs2_unlink_ok - check to see that a inode is still in a directory
 * @dip: the directory
 * @name: the name of the file
 * @ip: the inode
 *
 * Assumes that the lock on (at least) @dip is held.
 *
 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
 */

static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
			  const struct gfs2_inode *ip)
{
	int error;

	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
		return -EPERM;

	if ((dip->i_inode.i_mode & S_ISVTX) &&
1037 1038
	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1039 1040 1041 1042 1043
		return -EPERM;

	if (IS_APPEND(&dip->i_inode))
		return -EPERM;

1044
	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1045 1046 1047
	if (error)
		return error;

1048
	return gfs2_dir_check(&dip->i_inode, name, ip);
1049 1050
}

D
David Teigland 已提交
1051
/**
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
 * @dip: The parent directory
 * @name: The name of the entry in the parent directory
 * @inode: The inode to be removed
 *
 * Called with all the locks and in a transaction. This will only be
 * called for a directory after it has been checked to ensure it is empty.
 *
 * Returns: 0 on success, or an error
 */

static int gfs2_unlink_inode(struct gfs2_inode *dip,
1064
			     const struct dentry *dentry)
1065
{
1066
	struct inode *inode = d_inode(dentry);
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
	struct gfs2_inode *ip = GFS2_I(inode);
	int error;

	error = gfs2_dir_del(dip, dentry);
	if (error)
		return error;

	ip->i_entries = 0;
	inode->i_ctime = CURRENT_TIME;
	if (S_ISDIR(inode->i_mode))
		clear_nlink(inode);
	else
		drop_nlink(inode);
	mark_inode_dirty(inode);
	if (inode->i_nlink == 0)
		gfs2_unlink_di(inode);
	return 0;
}


/**
 * gfs2_unlink - Unlink an inode (this does rmdir as well)
 * @dir: The inode of the directory containing the inode to unlink
D
David Teigland 已提交
1090 1091
 * @dentry: The file itself
 *
1092 1093
 * This routine uses the type of the inode as a flag to figure out
 * whether this is an unlink or an rmdir.
D
David Teigland 已提交
1094 1095 1096 1097 1098 1099
 *
 * Returns: errno
 */

static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
{
1100 1101
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1102
	struct inode *inode = d_inode(dentry);
1103
	struct gfs2_inode *ip = GFS2_I(inode);
R
Russell Cattelan 已提交
1104 1105
	struct gfs2_holder ghs[3];
	struct gfs2_rgrpd *rgd;
1106 1107 1108 1109 1110 1111 1112
	int error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	error = -EROFS;
D
David Teigland 已提交
1113 1114

	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
R
Russell Cattelan 已提交
1115
	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
D
David Teigland 已提交
1116

S
Steven Whitehouse 已提交
1117
	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1118
	if (!rgd)
1119
		goto out_inodes;
1120

R
Russell Cattelan 已提交
1121 1122 1123
	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);


1124
	error = gfs2_glock_nq(ghs); /* parent */
D
David Teigland 已提交
1125
	if (error)
1126 1127 1128 1129 1130 1131
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
	if (error)
		goto out_child;

1132
	error = -ENOENT;
1133
	if (inode->i_nlink == 0)
1134 1135
		goto out_rgrp;

1136 1137 1138 1139 1140 1141
	if (S_ISDIR(inode->i_mode)) {
		error = -ENOTEMPTY;
		if (ip->i_entries > 2 || inode->i_nlink > 2)
			goto out_rgrp;
	}

1142 1143 1144
	error = gfs2_glock_nq(ghs + 2); /* rgrp */
	if (error)
		goto out_rgrp;
D
David Teigland 已提交
1145 1146 1147

	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
	if (error)
1148
		goto out_gunlock;
D
David Teigland 已提交
1149

1150 1151 1152
	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1153

1154
	error = gfs2_unlink_inode(dip, dentry);
D
David Teigland 已提交
1155

1156 1157
out_end_trans:
	gfs2_trans_end(sdp);
1158
out_gunlock:
1159 1160 1161 1162 1163 1164
	gfs2_glock_dq(ghs + 2);
out_rgrp:
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
1165 1166 1167
	gfs2_holder_uninit(ghs + 2);
out_inodes:
	gfs2_holder_uninit(ghs + 1);
1168
	gfs2_holder_uninit(ghs);
D
David Teigland 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	return error;
}

/**
 * gfs2_symlink - Create a symlink
 * @dir: The directory to create the symlink in
 * @dentry: The dentry to put the symlink in
 * @symname: The thing which the link points to
 *
 * Returns: errno
 */

static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
			const char *symname)
{
1184
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1185
	unsigned int size;
D
David Teigland 已提交
1186 1187 1188 1189 1190

	size = strlen(symname);
	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
		return -ENAMETOOLONG;

1191
	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
D
David Teigland 已提交
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
}

/**
 * gfs2_mkdir - Make a directory
 * @dir: The parent directory of the new one
 * @dentry: The dentry of the new directory
 * @mode: The mode of the new directory
 *
 * Returns: errno
 */

1203
static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
D
David Teigland 已提交
1204
{
1205 1206
	struct gfs2_sbd *sdp = GFS2_SB(dir);
	unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1207
	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
D
David Teigland 已提交
1208 1209 1210 1211 1212 1213 1214
}

/**
 * gfs2_mknod - Make a special file
 * @dir: The directory in which the special file will reside
 * @dentry: The dentry of the special file
 * @mode: The mode of the special file
1215
 * @dev: The device specification of the special file
D
David Teigland 已提交
1216 1217 1218
 *
 */

A
Al Viro 已提交
1219
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
D
David Teigland 已提交
1220 1221
		      dev_t dev)
{
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
}

/**
 * gfs2_atomic_open - Atomically open a file
 * @dir: The directory
 * @dentry: The proposed new entry
 * @file: The proposed new struct file
 * @flags: open flags
 * @mode: File mode
 * @opened: Flag to say whether the file has been opened or not
 *
 * Returns: error code or 0 for success
 */

static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1238 1239
			    struct file *file, unsigned flags,
			    umode_t mode, int *opened)
1240 1241 1242 1243
{
	struct dentry *d;
	bool excl = !!(flags & O_EXCL);

1244 1245 1246
	if (!d_unhashed(dentry))
		goto skip_lookup;

1247 1248 1249
	d = __gfs2_lookup(dir, dentry, file, opened);
	if (IS_ERR(d))
		return PTR_ERR(d);
M
Miklos Szeredi 已提交
1250 1251
	if (d != NULL)
		dentry = d;
1252
	if (d_really_is_positive(dentry)) {
1253 1254
		if (!(*opened & FILE_OPENED))
			return finish_no_open(file, d);
M
Miklos Szeredi 已提交
1255
		dput(d);
1256 1257 1258
		return 0;
	}

M
Miklos Szeredi 已提交
1259
	BUG_ON(d != NULL);
1260 1261

skip_lookup:
1262 1263 1264 1265
	if (!(flags & O_CREAT))
		return -ENOENT;

	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
D
David Teigland 已提交
1266 1267
}

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
/*
 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
 * @this: move this
 * @to: to here
 *
 * Follow @to back to the root and make sure we don't encounter @this
 * Assumes we already hold the rename lock.
 *
 * Returns: errno
 */

static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
{
	struct inode *dir = &to->i_inode;
	struct super_block *sb = dir->i_sb;
	struct inode *tmp;
	int error = 0;

	igrab(dir);

	for (;;) {
		if (dir == &this->i_inode) {
			error = -EINVAL;
			break;
		}
1293
		if (dir == d_inode(sb->s_root)) {
1294 1295 1296 1297
			error = 0;
			break;
		}

1298
		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1299 1300 1301 1302
		if (!tmp) {
			error = -ENOENT;
			break;
		}
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
		if (IS_ERR(tmp)) {
			error = PTR_ERR(tmp);
			break;
		}

		iput(dir);
		dir = tmp;
	}

	iput(dir);

	return error;
}

1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
/**
 * update_moved_ino - Update an inode that's being moved
 * @ip: The inode being moved
 * @ndip: The parent directory of the new filename
 * @dir_rename: True of ip is a directory
 *
 * Returns: errno
 */

static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
			    int dir_rename)
{
	int error;
	struct buffer_head *dibh;

	if (dir_rename)
		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;
	ip->i_inode.i_ctime = CURRENT_TIME;
	gfs2_trans_add_meta(ip->i_gl, dibh);
	gfs2_dinode_out(ip, dibh->b_data);
	brelse(dibh);
	return 0;
}


D
David Teigland 已提交
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
/**
 * gfs2_rename - Rename a file
 * @odir: Parent directory of old file name
 * @odentry: The old dentry of the file
 * @ndir: Parent directory of new file name
 * @ndentry: The new dentry of the file
 *
 * Returns: errno
 */

static int gfs2_rename(struct inode *odir, struct dentry *odentry,
		       struct inode *ndir, struct dentry *ndentry)
{
1359 1360
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
1361
	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
D
David Teigland 已提交
1362
	struct gfs2_inode *nip = NULL;
1363
	struct gfs2_sbd *sdp = GFS2_SB(odir);
1364
	struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
R
Russell Cattelan 已提交
1365
	struct gfs2_rgrpd *nrgd;
D
David Teigland 已提交
1366 1367
	unsigned int num_gh;
	int dir_rename = 0;
1368
	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
D
David Teigland 已提交
1369 1370 1371
	unsigned int x;
	int error;

1372 1373
	if (d_really_is_positive(ndentry)) {
		nip = GFS2_I(d_inode(ndentry));
D
David Teigland 已提交
1374 1375 1376 1377
		if (ip == nip)
			return 0;
	}

1378 1379 1380 1381
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

1382
	error = gfs2_rsqa_alloc(ndip);
1383 1384 1385
	if (error)
		return error;

1386 1387 1388
	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
D
David Teigland 已提交
1389 1390 1391
		if (error)
			goto out;

1392 1393
		if (S_ISDIR(ip->i_inode.i_mode)) {
			dir_rename = 1;
1394
			/* don't move a directory into its subdir */
1395 1396 1397 1398
			error = gfs2_ok_to_move(ip, ndip);
			if (error)
				goto out_gunlock_r;
		}
D
David Teigland 已提交
1399 1400
	}

1401
	num_gh = 1;
D
David Teigland 已提交
1402
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1403 1404 1405 1406 1407 1408
	if (odip != ndip) {
		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
	}
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;
D
David Teigland 已提交
1409

1410 1411 1412
	if (nip) {
		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
R
Russell Cattelan 已提交
1413 1414 1415 1416
		/* grab the resource lock for unlink flag twiddling 
		 * this is the case of the target file already existing
		 * so we unlink before doing the rename
		 */
S
Steven Whitehouse 已提交
1417
		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
R
Russell Cattelan 已提交
1418 1419
		if (nrgd)
			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1420
	}
D
David Teigland 已提交
1421

1422 1423 1424 1425 1426
	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1427

1428 1429 1430 1431
	error = -ENOENT;
	if (ip->i_inode.i_nlink == 0)
		goto out_gunlock;

D
David Teigland 已提交
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
	/* Check out the old directory */

	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
	if (error)
		goto out_gunlock;

	/* Check out the new directory */

	if (nip) {
		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
		if (error)
			goto out_gunlock;

1445 1446 1447 1448 1449
		if (nip->i_inode.i_nlink == 0) {
			error = -EAGAIN;
			goto out_gunlock;
		}

1450
		if (S_ISDIR(nip->i_inode.i_mode)) {
1451
			if (nip->i_entries < 2) {
1452
				gfs2_consist_inode(nip);
D
David Teigland 已提交
1453 1454 1455
				error = -EIO;
				goto out_gunlock;
			}
1456
			if (nip->i_entries > 2) {
D
David Teigland 已提交
1457 1458 1459 1460 1461
				error = -ENOTEMPTY;
				goto out_gunlock;
			}
		}
	} else {
1462
		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
1463 1464 1465
		if (error)
			goto out_gunlock;

1466
		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
D
David Teigland 已提交
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
		switch (error) {
		case -ENOENT:
			error = 0;
			break;
		case 0:
			error = -EEXIST;
		default:
			goto out_gunlock;
		};

		if (odip != ndip) {
1478
			if (!ndip->i_inode.i_nlink) {
1479
				error = -ENOENT;
D
David Teigland 已提交
1480 1481
				goto out_gunlock;
			}
1482
			if (ndip->i_entries == (u32)-1) {
D
David Teigland 已提交
1483 1484 1485
				error = -EFBIG;
				goto out_gunlock;
			}
1486
			if (S_ISDIR(ip->i_inode.i_mode) &&
1487
			    ndip->i_inode.i_nlink == (u32)-1) {
D
David Teigland 已提交
1488 1489 1490 1491 1492 1493 1494 1495 1496
				error = -EMLINK;
				goto out_gunlock;
			}
		}
	}

	/* Check out the dir to be renamed */

	if (dir_rename) {
1497
		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
D
David Teigland 已提交
1498 1499 1500 1501
		if (error)
			goto out_gunlock;
	}

1502 1503 1504 1505 1506
	if (nip == NULL) {
		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1507

1508 1509
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1510
		error = gfs2_quota_lock_check(ndip, &ap);
D
David Teigland 已提交
1511
		if (error)
1512
			goto out_gunlock;
D
David Teigland 已提交
1513

1514
		error = gfs2_inplace_reserve(ndip, &ap);
D
David Teigland 已提交
1515 1516 1517
		if (error)
			goto out_gunlock_q;

1518 1519
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
					 4 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1520 1521 1522 1523
		if (error)
			goto out_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
S
S. Wendy Cheng 已提交
1524
					 5 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1525 1526 1527 1528 1529 1530
		if (error)
			goto out_gunlock;
	}

	/* Remove the target file, if it exists */

1531 1532
	if (nip)
		error = gfs2_unlink_inode(ndip, ndentry);
D
David Teigland 已提交
1533

1534 1535 1536
	error = update_moved_ino(ip, ndip, dir_rename);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1537

1538
	error = gfs2_dir_del(odip, odentry);
D
David Teigland 已提交
1539 1540 1541
	if (error)
		goto out_end_trans;

1542
	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
D
David Teigland 已提交
1543 1544 1545
	if (error)
		goto out_end_trans;

1546
out_end_trans:
D
David Teigland 已提交
1547
	gfs2_trans_end(sdp);
1548
out_ipreserv:
1549
	if (da.nr_blocks)
D
David Teigland 已提交
1550
		gfs2_inplace_release(ndip);
1551
out_gunlock_q:
1552
	if (da.nr_blocks)
D
David Teigland 已提交
1553
		gfs2_quota_unlock(ndip);
1554
out_gunlock:
1555
	gfs2_dir_no_add(&da);
1556 1557
	while (x--) {
		gfs2_glock_dq(ghs + x);
D
David Teigland 已提交
1558
		gfs2_holder_uninit(ghs + x);
1559
	}
1560
out_gunlock_r:
1561
	if (r_gh.gh_gl)
D
David Teigland 已提交
1562
		gfs2_glock_dq_uninit(&r_gh);
1563
out:
D
David Teigland 已提交
1564 1565 1566
	return error;
}

1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
/**
 * gfs2_exchange - exchange two files
 * @odir: Parent directory of old file name
 * @odentry: The old dentry of the file
 * @ndir: Parent directory of new file name
 * @ndentry: The new dentry of the file
 * @flags: The rename flags
 *
 * Returns: errno
 */

static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
			 struct inode *ndir, struct dentry *ndentry,
			 unsigned int flags)
{
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
	struct gfs2_sbd *sdp = GFS2_SB(odir);
	struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
	unsigned int num_gh;
	unsigned int x;
	umode_t old_mode = oip->i_inode.i_mode;
	umode_t new_mode = nip->i_inode.i_mode;
	int error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
		if (error)
			goto out;

		if (S_ISDIR(old_mode)) {
			/* don't move a directory into its subdir */
			error = gfs2_ok_to_move(oip, ndip);
			if (error)
				goto out_gunlock_r;
		}

		if (S_ISDIR(new_mode)) {
			/* don't move a directory into its subdir */
			error = gfs2_ok_to_move(nip, odip);
			if (error)
				goto out_gunlock_r;
		}
	}

	num_gh = 1;
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	if (odip != ndip) {
		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
	}
	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;

	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;

	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}

	error = -ENOENT;
	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
		goto out_gunlock;

	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
	if (error)
		goto out_gunlock;
	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
	if (error)
		goto out_gunlock;

	if (S_ISDIR(old_mode)) {
		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
		if (error)
			goto out_gunlock;
	}
	if (S_ISDIR(new_mode)) {
		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
		if (error)
			goto out_gunlock;
	}
	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
	if (error)
		goto out_gunlock;

	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
	if (error)
		goto out_end_trans;

	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
	if (error)
		goto out_end_trans;

	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
			       IF2DT(old_mode));
	if (error)
		goto out_end_trans;

	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
			       IF2DT(new_mode));
	if (error)
		goto out_end_trans;

	if (odip != ndip) {
		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
			inc_nlink(&odip->i_inode);
			drop_nlink(&ndip->i_inode);
		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
			inc_nlink(&ndip->i_inode);
			drop_nlink(&odip->i_inode);
		}
	}
	mark_inode_dirty(&ndip->i_inode);
	if (odip != ndip)
		mark_inode_dirty(&odip->i_inode);

out_end_trans:
	gfs2_trans_end(sdp);
out_gunlock:
	while (x--) {
		gfs2_glock_dq(ghs + x);
		gfs2_holder_uninit(ghs + x);
	}
out_gunlock_r:
	if (r_gh.gh_gl)
		gfs2_glock_dq_uninit(&r_gh);
out:
	return error;
}

static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
			struct inode *ndir, struct dentry *ndentry,
			unsigned int flags)
{
	flags &= ~RENAME_NOREPLACE;

	if (flags & ~RENAME_EXCHANGE)
		return -EINVAL;

	if (flags & RENAME_EXCHANGE)
		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);

	return gfs2_rename(odir, odentry, ndir, ndentry);
}

1722
/**
1723
 * gfs2_get_link - Follow a symbolic link
A
Al Viro 已提交
1724
 * @dentry: The dentry of the link
1725
 * @inode: The inode of the link
1726
 * @done: destructor for return value
1727
 *
A
Al Viro 已提交
1728
 * This can handle symlinks of any size.
1729
 *
A
Al Viro 已提交
1730
 * Returns: 0 on success or error code
1731 1732
 */

1733
static const char *gfs2_get_link(struct dentry *dentry,
1734 1735
				 struct inode *inode,
				 struct delayed_call *done)
1736
{
1737
	struct gfs2_inode *ip = GFS2_I(inode);
1738 1739
	struct gfs2_holder i_gh;
	struct buffer_head *dibh;
1740
	unsigned int size;
A
Al Viro 已提交
1741
	char *buf;
1742 1743
	int error;

1744 1745 1746
	if (!dentry)
		return ERR_PTR(-ECHILD);

1747 1748 1749 1750
	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
	error = gfs2_glock_nq(&i_gh);
	if (error) {
		gfs2_holder_uninit(&i_gh);
1751
		return ERR_PTR(error);
1752 1753
	}

S
Steven Whitehouse 已提交
1754 1755
	size = (unsigned int)i_size_read(&ip->i_inode);
	if (size == 0) {
1756
		gfs2_consist_inode(ip);
A
Al Viro 已提交
1757
		buf = ERR_PTR(-EIO);
1758 1759 1760 1761
		goto out;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
A
Al Viro 已提交
1762 1763
	if (error) {
		buf = ERR_PTR(error);
1764 1765 1766
		goto out;
	}

1767
	buf = kzalloc(size + 1, GFP_NOFS);
A
Al Viro 已提交
1768 1769 1770
	if (!buf)
		buf = ERR_PTR(-ENOMEM);
	else
1771
		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1772 1773 1774
	brelse(dibh);
out:
	gfs2_glock_dq_uninit(&i_gh);
1775
	if (!IS_ERR(buf))
1776
		set_delayed_call(done, kfree_link, buf);
1777
	return buf;
D
David Teigland 已提交
1778 1779 1780 1781
}

/**
 * gfs2_permission -
1782 1783 1784
 * @inode: The inode
 * @mask: The mask to be tested
 * @flags: Indicates whether this is an RCU path walk or not
D
David Teigland 已提交
1785
 *
1786 1787 1788 1789
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
 * lock the glock if its not already been done.
 *
D
David Teigland 已提交
1790 1791 1792
 * Returns: errno
 */

1793
int gfs2_permission(struct inode *inode, int mask)
D
David Teigland 已提交
1794
{
1795
	struct gfs2_inode *ip;
D
David Teigland 已提交
1796 1797
	struct gfs2_holder i_gh;
	int error;
1798
	int unlock = 0;
D
David Teigland 已提交
1799

1800 1801

	ip = GFS2_I(inode);
1802
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1803 1804 1805 1806 1807 1808
		if (mask & MAY_NOT_BLOCK)
			return -ECHILD;
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
		if (error)
			return error;
		unlock = 1;
1809
	}
D
David Teigland 已提交
1810

M
Miklos Szeredi 已提交
1811 1812 1813
	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
		error = -EACCES;
	else
1814
		error = generic_permission(inode, mask);
1815
	if (unlock)
D
David Teigland 已提交
1816 1817 1818 1819 1820
		gfs2_glock_dq_uninit(&i_gh);

	return error;
}

S
Steven Whitehouse 已提交
1821
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
{
	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
}

/**
 * gfs2_setattr_simple -
 * @ip:
 * @attr:
 *
 * Returns: errno
 */

S
Steven Whitehouse 已提交
1836
int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1837 1838 1839 1840
{
	int error;

	if (current->journal_info)
S
Steven Whitehouse 已提交
1841
		return __gfs2_setattr_simple(inode, attr);
1842

S
Steven Whitehouse 已提交
1843
	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1844 1845 1846
	if (error)
		return error;

S
Steven Whitehouse 已提交
1847 1848
	error = __gfs2_setattr_simple(inode, attr);
	gfs2_trans_end(GFS2_SB(inode));
1849 1850 1851
	return error;
}

D
David Teigland 已提交
1852 1853
static int setattr_chown(struct inode *inode, struct iattr *attr)
{
1854 1855
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_sbd *sdp = GFS2_SB(inode);
1856 1857
	kuid_t ouid, nuid;
	kgid_t ogid, ngid;
D
David Teigland 已提交
1858
	int error;
1859
	struct gfs2_alloc_parms ap;
D
David Teigland 已提交
1860

1861 1862
	ouid = inode->i_uid;
	ogid = inode->i_gid;
D
David Teigland 已提交
1863 1864 1865
	nuid = attr->ia_uid;
	ngid = attr->ia_gid;

1866
	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1867
		ouid = nuid = NO_UID_QUOTA_CHANGE;
1868
	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1869
		ogid = ngid = NO_GID_QUOTA_CHANGE;
D
David Teigland 已提交
1870

1871
	error = gfs2_rsqa_alloc(ip);
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
	if (error)
		goto out;

	error = gfs2_rindex_update(sdp);
	if (error)
		goto out;

	error = gfs2_quota_lock(ip, nuid, ngid);
	if (error)
		goto out;

1883 1884
	ap.target = gfs2_get_inode_blocks(&ip->i_inode);

1885 1886
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1887
		error = gfs2_quota_check(ip, nuid, ngid, &ap);
D
David Teigland 已提交
1888 1889 1890 1891 1892 1893 1894 1895
		if (error)
			goto out_gunlock_q;
	}

	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
	if (error)
		goto out_gunlock_q;

S
Steven Whitehouse 已提交
1896
	error = gfs2_setattr_simple(inode, attr);
D
David Teigland 已提交
1897 1898 1899
	if (error)
		goto out_end_trans;

1900 1901
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1902
		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1903
		gfs2_quota_change(ip, ap.target, nuid, ngid);
D
David Teigland 已提交
1904 1905
	}

1906
out_end_trans:
D
David Teigland 已提交
1907
	gfs2_trans_end(sdp);
1908
out_gunlock_q:
D
David Teigland 已提交
1909
	gfs2_quota_unlock(ip);
1910
out:
D
David Teigland 已提交
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926
	return error;
}

/**
 * gfs2_setattr - Change attributes on an inode
 * @dentry: The dentry which is changing
 * @attr: The structure describing the change
 *
 * The VFS layer wants to change one or more of an inodes attributes.  Write
 * that change out to disk.
 *
 * Returns: errno
 */

static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
{
1927
	struct inode *inode = d_inode(dentry);
1928
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1929 1930 1931
	struct gfs2_holder i_gh;
	int error;

1932
	error = gfs2_rsqa_alloc(ip);
1933 1934 1935
	if (error)
		return error;

D
David Teigland 已提交
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
	if (error)
		return error;

	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out;

	error = inode_change_ok(inode, attr);
	if (error)
		goto out;

	if (attr->ia_valid & ATTR_SIZE)
S
Steven Whitehouse 已提交
1949
		error = gfs2_setattr_size(inode, attr->ia_size);
D
David Teigland 已提交
1950 1951
	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
		error = setattr_chown(inode, attr);
1952
	else {
S
Steven Whitehouse 已提交
1953
		error = gfs2_setattr_simple(inode, attr);
1954 1955 1956
		if (!error && attr->ia_valid & ATTR_MODE)
			error = posix_acl_chmod(inode, inode->i_mode);
	}
D
David Teigland 已提交
1957

1958
out:
D
David Teigland 已提交
1959 1960
	if (!error)
		mark_inode_dirty(inode);
S
Steven Whitehouse 已提交
1961
	gfs2_glock_dq_uninit(&i_gh);
D
David Teigland 已提交
1962 1963 1964 1965 1966
	return error;
}

/**
 * gfs2_getattr - Read out an inode's attributes
1967
 * @mnt: The vfsmount the inode is being accessed from
D
David Teigland 已提交
1968 1969 1970
 * @dentry: The dentry to stat
 * @stat: The inode's stats
 *
1971 1972 1973 1974 1975 1976
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
 * lock the glock if its not already been done. Note that its the NFS
 * readdirplus operation which causes this to be called (from filldir)
 * with the glock already held.
 *
D
David Teigland 已提交
1977 1978 1979 1980 1981 1982
 * Returns: errno
 */

static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
			struct kstat *stat)
{
1983
	struct inode *inode = d_inode(dentry);
1984
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1985 1986
	struct gfs2_holder gh;
	int error;
1987
	int unlock = 0;
D
David Teigland 已提交
1988

1989
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1990 1991 1992 1993
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
		if (error)
			return error;
		unlock = 1;
D
David Teigland 已提交
1994 1995
	}

1996
	generic_fillattr(inode, stat);
1997
	if (unlock)
1998 1999 2000
		gfs2_glock_dq_uninit(&gh);

	return 0;
D
David Teigland 已提交
2001 2002 2003 2004 2005
}

static int gfs2_setxattr(struct dentry *dentry, const char *name,
			 const void *data, size_t size, int flags)
{
2006
	struct inode *inode = d_inode(dentry);
2007 2008 2009
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
2010

2011 2012 2013
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
2014
		ret = gfs2_rsqa_alloc(ip);
2015 2016
		if (ret == 0)
			ret = generic_setxattr(dentry, name, data, size, flags);
2017 2018 2019 2020
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2021 2022 2023 2024 2025
}

static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
			     void *data, size_t size)
{
2026
	struct inode *inode = d_inode(dentry);
2027 2028 2029
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
2030

2031 2032 2033 2034
	/* For selinux during lookup */
	if (gfs2_glock_is_locked_by_me(ip->i_gl))
		return generic_getxattr(dentry, name, data, size);

2035 2036 2037 2038 2039 2040 2041 2042
	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
		ret = generic_getxattr(dentry, name, data, size);
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2043 2044 2045 2046
}

static int gfs2_removexattr(struct dentry *dentry, const char *name)
{
2047
	struct inode *inode = d_inode(dentry);
2048 2049 2050
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;
D
David Teigland 已提交
2051

2052 2053 2054
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	ret = gfs2_glock_nq(&gh);
	if (ret == 0) {
2055
		ret = gfs2_rsqa_alloc(ip);
2056 2057
		if (ret == 0)
			ret = generic_removexattr(dentry, name);
2058 2059 2060 2061
		gfs2_glock_dq(&gh);
	}
	gfs2_holder_uninit(&gh);
	return ret;
D
David Teigland 已提交
2062 2063
}

2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		       u64 start, u64 len)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;

	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
	if (ret)
		return ret;

	mutex_lock(&inode->i_mutex);

	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
	if (ret)
		goto out;

	if (gfs2_is_stuffed(ip)) {
		u64 phys = ip->i_no_addr << inode->i_blkbits;
		u64 size = i_size_read(inode);
		u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
			    FIEMAP_EXTENT_DATA_INLINE;
		phys += sizeof(struct gfs2_dinode);
		phys += start;
		if (start + len > size)
			len = size - start;
		if (start < size)
			ret = fiemap_fill_next_extent(fieinfo, start, phys,
						      len, flags);
		if (ret == 1)
			ret = 0;
	} else {
		ret = __generic_block_fiemap(inode, fieinfo, start, len,
					     gfs2_block_map);
	}

	gfs2_glock_dq_uninit(&gh);
out:
	mutex_unlock(&inode->i_mutex);
	return ret;
}

2106
const struct inode_operations gfs2_file_iops = {
2107
	.permission = gfs2_permission,
D
David Teigland 已提交
2108 2109 2110 2111 2112 2113
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2114
	.fiemap = gfs2_fiemap,
2115
	.get_acl = gfs2_get_acl,
2116
	.set_acl = gfs2_set_acl,
D
David Teigland 已提交
2117 2118
};

2119
const struct inode_operations gfs2_dir_iops = {
D
David Teigland 已提交
2120 2121 2122 2123 2124 2125
	.create = gfs2_create,
	.lookup = gfs2_lookup,
	.link = gfs2_link,
	.unlink = gfs2_unlink,
	.symlink = gfs2_symlink,
	.mkdir = gfs2_mkdir,
2126
	.rmdir = gfs2_unlink,
D
David Teigland 已提交
2127
	.mknod = gfs2_mknod,
2128
	.rename2 = gfs2_rename2,
2129
	.permission = gfs2_permission,
D
David Teigland 已提交
2130 2131 2132 2133 2134 2135
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2136
	.fiemap = gfs2_fiemap,
2137
	.get_acl = gfs2_get_acl,
2138
	.set_acl = gfs2_set_acl,
2139
	.atomic_open = gfs2_atomic_open,
D
David Teigland 已提交
2140 2141
};

2142
const struct inode_operations gfs2_symlink_iops = {
A
Al Viro 已提交
2143
	.readlink = generic_readlink,
2144
	.get_link = gfs2_get_link,
2145
	.permission = gfs2_permission,
D
David Teigland 已提交
2146 2147 2148 2149 2150 2151
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.setxattr = gfs2_setxattr,
	.getxattr = gfs2_getxattr,
	.listxattr = gfs2_listxattr,
	.removexattr = gfs2_removexattr,
2152
	.fiemap = gfs2_fiemap,
D
David Teigland 已提交
2153 2154
};